Convert app_launch_index and page_index from int to StringOrdinal.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 854ef8b9a989882bca9720e4837da0c74dd6e1cb..ca109015968c43e5b3228421c10f37a54688d639 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -2024,7 +2024,9 @@ void ExtensionService::UpdateActiveExtensionsInCrashReporter() {
 }
 
 void ExtensionService::OnExtensionInstalled(
-    const Extension* extension, bool from_webstore, int page_index) {
+    const Extension* extension,
+    bool from_webstore,
+    StringOrdinal page_ordinal) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   // Ensure extension is deleted unless we transfer ownership.
@@ -2081,7 +2083,7 @@ void ExtensionService::OnExtensionInstalled(
       extension,
       initial_enable ? Extension::ENABLED : Extension::DISABLED,
       from_webstore,
-      page_index);
+      page_ordinal);
 
   // Unpacked extensions default to allowing file access, but if that has been
   // overridden, don't reset the value.